Electronic smoking article and improved heater element

An electronic cigarette includes a liquid supply including liquid material, a heater operable to heat the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol, and a wick in communication with the liquid material and in communication with the heater such that the wick delivers the liquid material to the heater. The heater is formed of a mesh material.

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Description
CROSS REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. application Ser. No. 15/040,763 filed on Feb. 10, 2016, which is a divisional application of U.S. application Ser. No. 13/774,609, filed on Feb. 22, 2013, which claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application No. 61/601,889, filed on Feb. 22, 2012, the entire contents of each of which are incorporated herein by reference thereto.

SUMMARY OF SELECTED FEATURES

An electronic cigarette includes a heater comprising a ribbon of electrically resistive mesh material wound about a wick. The wick is in communication with a liquid supply containing liquid material. The heater is operative to vaporize liquid material to produce an aerosol.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of an electronic cigarette according to a first embodiment wherein the mouth-end insert includes diverging outlets.

FIG. 2 is a perspective view of a mouth-end insert for use with the electronic cigarette of FIG. 1.

FIG. 3 is a cross-sectional view along line B-B of the mouth-end insert of FIG. 2.

FIG. 4 is a cross-sectional view of an electronic cigarette according to the first embodiment and further including a sleeve assembly.

FIG. 5 is a top view of an electronic cigarette including an aroma strip on an outer surface thereof.

FIG. 6 is a cross-sectional view of a second embodiment of a mouth-end insert for use with the electronic cigarettes of FIGS. 1 and 4.

FIG. 7 is an exploded view of the mouth-end insert of FIG. 6.

FIG. 8 is an enlarged view of a heater for use in the electronic cigarette of FIGS. 1 and 4, wherein the heater is formed of a mesh material.

FIG. 9 is an enlarged view of a heater, wherein the heater includes a brazed connection region.

FIG. 10 is an enlarged view of an embodiment of the mesh heater and wick assembly as positioned within the electronic cigarette and including a brazed connection region.

FIG. 11 is an enlarged view of another embodiment of the mesh heater and wick assembly as positioned within the electronic cigarette and including a brazed connection region.

FIG. 12 is an abbreviated, cross-sectional view of an electronic cigarette including a longitudinally extending heater.

DETAILED DESCRIPTION

An electronic cigarette (smoking article) includes a mesh heater element and in a preferred embodiment, a heater formed of a ribbon of electrically resistive mesh material wrapped around a wick that is in fluid communication with a liquid supply. The use of a planar metal ribbon such as a mesh material as the heater provides many advantages. The wrapped ribbon provides increased surface to surface contact between the heater and the wick so as to provide more efficient and uniform transfer of heat between the heater and the wick. The arrangement provides a greater volume of aerosol for the same amount of electrical energy, than a wire heater (a single wire coil). In addition, dimensions of the ribbon heater may be adjusted to achieve a higher or lower electrical resistivity to meet design requirements of a particular electronic cigarette. Being a ribbon of material, the resistivity of the ribbon heater can be more consistently controlled from one heater to the next. Likewise, because of the size of the ribbon heater, the wrapping of the ribbon heater about the wick may be more consistently controlled.

Preferably, the ribbon heater is wrapped uniformly about the wick so that there is uniform spacing between windings of the ribbon heater about the wick. The size and surface to surface contact between the ribbon heater and the wick ensures retention of the uniform spacing which in turn ensures uniform heating of the wick.

As shown in FIGS. 1 and 4, an electronic cigarette 60 comprises a replaceable cartridge (or first section) 70 and a reusable fixture (or second section) 72, which are coupled together at a threaded connection 205 or by other convenience such as a snug-fit, detent, snap-fit, clamp and/or clasp. The first section 70 includes an outer tube 6 (or casing) extending in a longitudinal direction and an inner tube 62 coaxially positioned within the outer tube 6. The electronic cigarette 60 also includes a central air passage 20 in an upstream seal 15. The central air passage 20 opens to the inner tube 62. Moreover, the electronic cigarette 60 includes a liquid supply 22. The liquid supply 22 comprises a liquid material and optionally a liquid storage medium 210 (shown in FIG. 1) operable to store the liquid material therein. Preferably, the liquid supply 22 is contained in an outer annulus between the outer tube 6 and the inner tube 62. The annulus is sealed at an upstream end by seal 15 and liquid stopper 10 at a downstream end so as to prevent leakage of the liquid material from the liquid supply 22. Thus, the liquid supply 22 at least partially surrounds the central air passage 20. In other embodiments, the liquid supply 22 could be a self-contained bottle or other vessel capable of containing liquid. A heater 14 extends transversely across the central channel 21.

In the preferred embodiment, the heater 14 is also contained in the inner tube 62 downstream of and in spaced apart relation to the central air passage 20. A wick 28 is in communication with the liquid material in the liquid supply 22 and in communication with the heater 14 such that the wick 28 disposes liquid material in proximate relation to the heater 14. The wick 28 preferably comprises filaments having a capacity to draw a liquid, more preferably a bundle of glass (or ceramic) filaments and most preferably a bundle comprising a group of windings of glass filaments, preferably three of such windings, all which arrangements are capable of drawing liquid via capillary action via interstitial spacings between the filaments. Preferably, the wick 28 is flexible and includes three strands, each strand including a plurality of filaments. Moreover, it is noted that the end portions 29 and 31 of the wick 28 are flexible and foldable into the confines of the liquid supply region 22. The wick 28 can include filaments having a cross-section which is generally cross-shaped, clover-shaped, Y-shaped or in any other suitable shape.

Preferably, the wick 28 includes any suitable material or combination of materials. Examples of suitable materials are ceramic- or graphite-based materials. Moreover, the wick 28 may have any suitable capillarity and porosity to accommodate aerosol generating liquids having different liquid physical properties such as density, viscosity, surface tension and vapor pressure. The capillary properties of the wick 28, combined with the properties of the liquid, ensure that the wick 28 is always wet in the area of the heater 14 to avoid overheating of the heater 14.

A power supply 1 in the fixture 72 is operable to apply voltage across the heater 14. The electronic cigarette 60 also includes at least one air inlet 44 operable to deliver air to the central air passage 20 and/or other portions of the inner tube 62.

The electronic cigarette 60 further includes a mouth-end insert 8 having at least two off-axis, preferably diverging outlets 24 (e.g., 3, 4, 5 or more, preferably 2 to 10 outlets or more, more preferably 6 to 8 outlets, even more preferably 2 to 6 outlets or 4 outlets). The mouth-end insert 8 is in fluid communication with the central air passage 20 via the interior of inner tube 62 and a central passage 63, which extends through the stopper 10.

Moreover, as shown in FIGS. 1, 4, 10 and 11, the heater 14 extends in a direction transverse to the longitudinal direction and heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol. In other embodiments, other orientations of the heater 14 are contemplated, such as shown in FIG. 12, the heater 14 is arranged longitudinally within the inner tube 62. By arranging the heater 14 longitudinally, the surface of the heater 14 is within the inner tube and delivers a larger volume of aerosol than heaters extending transverse to the longitudinal direction and into the outer annulus. Also preferably, as shown, the heater 14 is arranged centrally within the inner tube 62. However, in other embodiments the heater 14 can be arranged adjacent an inner surface of the inner tube 62.

Referring now to FIG. 1, the wick 28, liquid supply 22 and mouth-end insert 8 are contained in the first section 70 and the power supply 1 is contained in a second section 72. In one embodiment, the first section (the cartridge) 70 is disposable and the second section (the fixture) 72 is reusable. The sections 70, 72 can be attached by a threaded connection 205 whereby the downstream section 70 can be replaced when the liquid supply 22 is used up. Having a separate first section 70 and second section 72 provides a number of advantages. First, if the first section 70 contains the at least one heater 14, the liquid supply 22 and the wick 28, all elements which are potentially in contact with the liquid are disposed of when the first section 70 is replaced. Thus, there will be no cross-contamination between different first sections 70, for example, when using different liquid materials. Also, if the first section 70 is replaced at suitable intervals, there is little chance of the heater becoming clogged with liquid. Moreover, the amount of liquid in the liquid supply 22 can be chosen such that the liquid supply 22 is depleted once a full battery charge is also depleted. Thus, the first section 70 could be replaced with every battery charge. Optionally, the first section 70 and the second section 72 are arranged to releasably lock together when engaged.

In the preferred embodiment, the at least one air inlet 44 includes one or two air inlets. Alternatively, there may be three, four, five or more air inlets. Preferably, if there is more than one air inlet, the air inlets are located at different locations along the electronic cigarette 60. For example, as shown in FIGS. 4 and 5, an air inlet 44a can be positioned at the upstream end of the cigarette adjacent puff sensor 16 such that the puff sensor supplies power to the heater upon sensing a puff by the smoker. Air inlet 44a should communicate with the mouth-end insert 8 so that a draw upon the electronic cigarette activates the puff sensor. The air from air inlet 44a can then flow along the battery and to the central air passage 20 in the seal 15 and/or to other portions of the inner tube 62 and/or outer tube 6. At least one additional air inlet 44 can be located adjacent and upstream of the seal 15 or at any other desirable location. Altering the size and number of air inlets 44 can also aid in establishing the resistance to draw of the electronic cigarette 60.

In a preferred embodiment, the heater 14 is arranged to communicate with the wick 28 and to heat the liquid material contained in the wick 28 to a temperature sufficient to vaporize the liquid material and form an aerosol.

Preferably, the heater 14 is preferably a ribbon of wire mesh wound about a wick 28. Examples of suitable electrically resistive materials include titanium, zirconium, tantalum and metals from the platinum group. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminium-titanium-zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel. For example, the heater can be formed of nickel aluminides, a material with a layer of alumina on the surface, iron aluminides and other composite materials, the electrically resistive material may optionally be embedded in, encapsulated or coated with an insulating material or vice-versa, depending on the kinetics of energy transfer and the external physicochemical properties required. Preferably, the heater 14 comprises at least one material selected from the group consisting of stainless steel, copper, copper alloys, nickel-chromium alloys, superalloys and combinations thereof. In a preferred embodiment, the heater 14 is formed of nickel-chromium alloys or iron-chromium alloys.

In another embodiment, the heater 14 may be constructed of an iron-aluminide (e.g., FeAl or Fe3Al), such as those described in commonly owned U.S. Pat. No. 5,595,706 to Sikka et al. filed Dec. 29, 1994, or nickel aluminides (e.g., Ni3Al). Use of iron-aluminides is particularly advantageous in that they exhibit high resistivity. FeAl exhibits a resistivity of approximately 180 micro-ohms, whereas stainless steel exhibits approximately 50 to 91 micro-ohms. The higher resistivity lowers current draw or load on the power source (battery) 1.

In a preferred embodiment, the mesh material heater 14 is formed of a thermally and/or electrically conductive material. Suitable materials for forming the mesh material are selected from the group consisting of stainless steel, copper, copper alloys, Inconel® available from Special Metals Corporation, which is a nickel-chromium alloy, Nichrome®, which is also a nickel-chromium alloy, and combinations thereof. Moreover, in a preferred embodiment, the mesh material heater 14 is formed of an iron-free nickel-chromium alloy.

In a preferred embodiment, the heater 14 comprises a ribbon of wire mesh which at least partially surrounds the wick 28. In that embodiment, preferably the heater may extend along the entire length of the wick 28 or only along a portion of the length of the wick 28.

In another embodiment, as shown in FIGS. 8-11, the heater 14 is formed of a planar metal ribbon such as a conductive mesh material wrapped around the wick 28. Preferably, the mesh material is wrapped completely around a portion of the wick 28 at least one turn, but preferably about a predetermined number of turns (e.g., two to ten turns or two to six turns). In the preferred embodiment, the mesh heater 14 is wrapped bout the wick 28 about four turns. Preferably, the mesh material is originally an elongate planar ribbon that is wrapped around the wick 28 to increase surface area contact between the heater 14 and the wick 28.

In an embodiment, as shown in FIGS. 8, 9, 10 and 11, a post or brazed, conductive connection region 99 is formed of a low-resistance material brazed across each end portion of the heater 14. By brazing a post 99 or forming a brazed connection region 99 at each end of the mesh heater 14, the electrical current conducts uniformly across the length and width of the mesh heater 14 so as to avoid hot spots. For example, the posts or brazed connection regions 99 can be formed of gold-plated wire. The posts or brazed connection regions 99 can be contained entirely in the outer annulus as shown in FIG. 10, such that the mesh heater 14 extends into the outer annulus. Alternatively, as shown in FIG. 11, the mesh heater 14 can be contained entirely within the inner tube 62 and the posts or brazed connection regions 99 can be contained within the inner tube, such that the electrical connection is formed within the inner tube 62. Electrical leads 26 are attached to each post or brazed connection regions 99, such that a heated zone is formed between the electrical leads 26 when voltage is applied by the power supply, so as to heat the liquid material in contact with the mesh material to a temperature sufficient to at least partially vaporize the liquid. Alternatively, the electrical leads 26 can be attached directly to the mesh heater 14.

A closure ring can slide over an outer surface of the inner tube so as to substantially close off a remainder of open space provided between the heater-wick element and the slot, as described in U.S. patent application Ser. No. 13/741,254 filed Jan. 14, 2013, the entire content of which is incorporated herein by reference thereto. Moreover, the mesh heater 14 preferably has a straight and uniformly spaced wrapping of the wick 28 so as to avoid hot spots.

In a preferred embodiment, the ribbon heater 14 is constructed from a wire mesh filament having a width in the range of about 0.5 mm to about 2 mm, preferably about 1 mm, and a length in the range of about 20 mm to about 40 mm. When wrapped about the wick 28, the ribbon heater 14 establishes a heater-wick element which extends in the range of about 10 mm to about 15 mm, preferably about 12 mm or less, and a width in the range of about 0.5 mm to about 2.0 mm, preferably about 1.5 mm or less. At about 1.5 mm width, the heater-wick element is preferably oriented longitudinally within the electronic cigarette whereas heater-wick elements having a smaller width may be placed in a transverse direction within the electronic cigarette.

In the preferred embodiment, the ribbon of mesh material can range in size from about 200 mesh to about 600 mesh. In the preferred embodiment, the mesh material is about 400 mesh and includes small voids/interstices 13 between the wires that form the mesh material. Preferably, the mesh material is formed with 0.001 inch or greater diameter wire, such as wire available from Smallparts, Inc. of Logansport, Ind. Also preferably, the wire comprising the mesh is a solid wire of about 0.0014 inch to about 0.0016 inch diameter.

In the preferred embodiment, the mesh material of the ribbon heater element 14 has a criss-cross, checkerboard type pattern with interstices 13 therein. Preferably, the ribbon mesh material is a single, elongate, flat layer of mesh material. Also preferably, the mesh material achieves an electrical resistance ranging from about 0.3 Ohm to about 10 Ohms, more preferably about 0.8 Ohm to about 5.0 Ohms, more preferably about 4.0 Ohms or less.

As noted above, because the mesh material heater 14 has a larger surface area, the heater 14 contacts a larger portion of the wick 28 so as to have a capacity to provide a larger amount of aerosol. In addition, the liquid can be drawn into the interstices 13 of the mesh material from the wick 28 during a power cycle of the electronic cigarette.

Advantageously, mesh material provides a workable range of resistivity for applications such as in electronic cigarettes. In addition, the use of a mesh material heater 14 allows release of aerosol through the heater itself. In addition, the mesh material heater 14 can enhance aerosolization of liquid from the wick 28.

In the preferred embodiment, the wick 28 comprises one or more filaments. As noted above, the wick 28 is at least partially surrounded by the heater 14. Moreover, in the preferred embodiment, the wick 28 extends through opposed openings in the inner tube 62 such that each end portion 29, 31 of the wick 28 is in contact with the liquid supply 22.

It has been observed that during a power cycle, aerosol is released from portions of the wick 28 disposed between windings of the ribbon heater 14 and through the ribbon heater 14 itself.

In the preferred embodiment, the wick 28 is fibrous. For example, the wick 28 may include a plurality of fibers or threads. The fibers or threads may be generally aligned in a direction perpendicular to the longitudinal direction of the electronic cigarette. In the preferred embodiment, the wick 28 comprises filaments having a capacity to draw a liquid, more preferably a bundle of glass (or ceramic) filaments and most preferably a bundle comprising a group of windings of glass filaments, preferably three of such windings, all which arrangements are capable of drawing liquid via capillary action via interstitial spacings between the filaments. Preferably, the wick 28 is flexible and includes three strands, each strand including a plurality of filaments.

In the preferred embodiment, the power supply 1 includes a battery arranged in the electronic cigarette 60 such that the anode is downstream of the cathode. A battery anode connector 4 contacts the downstream end of the battery. The heater 14 is connected to the battery by two spaced apart electrical leads 26 (shown in FIGS. 1, 4, 8, 9, 10, 11 and 12).

Preferably, the electrical contacts or connection between the heater 14 and the electrical leads 26 are highly conductive and temperature resistant while the heater 14 is highly resistive so that heat generation occurs primarily along the heater 14 and not at the contacts.

The battery can be a Lithium-ion battery or one of its variants, for example a Lithium-ion polymer battery. Alternatively, the battery may be a Nickel-metal hydride battery, a Nickel cadmium battery, a Lithium-manganese battery, a Lithium-cobalt battery or a fuel cell. In that case, preferably, the electronic cigarette 60 is usable by a smoker until the energy in the power supply is depleted. Alternatively, the power supply 1 may be rechargeable and include circuitry allowing the battery to be chargeable by an external charging device. In that case, preferably the circuitry, when charged, provides power for a pre-determined number of puffs, after which the circuitry must be re-connected to an external charging device.

Preferably, the electronic cigarette 60 also includes control circuitry including a puff sensor 16. The control circuitry can include an application specific integrated circuit (ASIC). The puff sensor 16 is operable to sense an air pressure drop and initiate application of voltage from the power supply 1 to the heater 14. The control circuitry can also include a heater activation light 48 operable to glow when the heater 14 is activated. Preferably, the heater activation light 48 comprises an LED and is at an upstream end of the electronic cigarette 60 so that the heater activation light 48 takes on the appearance of a burning coal during a puff. Moreover, the heater activation light 48 can be arranged to be visible to the smoker. In addition, the heater activation light 48 can be utilized for cigarette system diagnostics. The light 48 can also be configured such that the smoker can activate and/or deactivate the light 48 for privacy, such that the light 48 would not activate during smoking if desired.

Preferably, the at least one air inlet 44a is located adjacent the puff sensor 16, such that the puff sensor 16 senses air flow indicative of a smoker taking a puff and activates the power supply 1 and the heater activation light 48 to indicate that the heater 14 is working.

A control circuit is integrated with the puff sensor 16 and supplies power to the heater 14 responsive to the puff sensor 16, preferably with a maximum, time-period limiter.

Alternatively, the control circuitry may include a manually operable switch for a smoker to initiate a puff. The time-period of the electric current supply to the heater may be pre-set depending on the amount of liquid desired to be vaporized. The control circuitry is preferably programmable for this purpose. Alternatively, the circuitry may supply power to the heater as long as the puff sensor detects a pressure drop.

Preferably, when activated, the heater 14 heats a portion of the wick 28 surrounded by the heater for less than about 10 seconds, more preferably less than about 7 seconds. Thus, the power cycle (or maximum puff length) can range in period from about 2 seconds to about 10 seconds (e.g., about 3 seconds to about 9 seconds, about 4 seconds to about 8 seconds or about 5 seconds to about 7 seconds).

In the preferred embodiment, the liquid supply 22 includes a liquid storage medium 210 containing liquid material. Alternatively, the liquid supply 22 comprises only liquid material. The liquid supply 22 is contained in an outer annulus between inner tube 62 and outer tube 6 and between stopper 10 and the seal 15. Thus, the liquid supply 22 at least partially surrounds the central air passage 20 and heater 14 and the heater 14 extends between portions of the liquid supply 22.

Preferably, the liquid storage medium 210 of the liquid supply 22, if included, is a fibrous material comprising cotton, polyethylene, polyester, rayon and combinations thereof. The liquid storage medium 210 may comprise a winding of cotton gauze or other fibrous material about the inner tube 62. Preferably, the fibers or filaments in the liquid storage medium 210 have a diameter ranging in size from about 6 microns to about 15 microns (e.g., about 8 microns to about 12 microns or about 9 microns to about 11 microns). The liquid storage medium 210 can be a sintered, porous or foamed material. Also preferably, the filaments are sized to be irrespirable and can have a cross-section which has a y shape, cross shape, clover shape or any other suitable shape. In the alternative, the liquid supply region 22 may comprise a filled tank lacking a liquid storage medium 210 and containing only liquid material. In one embodiment, the liquid storage medium 210 can be constructed from an alumina ceramic.

Also preferably, the liquid material has a boiling point suitable for use in the electronic cigarette 60. If the boiling point is too high, the heater 14 will not be able to vaporize liquid in the wick 28. However, if the boiling point is too low, the liquid may vaporize without the heater 14 being activated.

Preferably, the liquid material includes a tobacco-containing material including volatile tobacco flavor compounds which are released from the liquid upon heating. The liquid may also be a tobacco flavor containing material or a nicotine-containing material. Alternatively, or in addition, the liquid may include a non-tobacco material and/or be nicotine-free. For example, the liquid may include water, solvents, ethanol, plant extracts and natural or artificial flavors. Preferably, the liquid further includes an aerosol former. Examples of suitable aerosol formers are glycerine and propylene glycol.

In use, liquid material is transferred from the liquid supply 22 and/or liquid storage medium 21 in proximity of the 14 heater by capillary action of the wick 28. In one embodiment, the wick 28 has a first end 29 and a second end 31 as shown in FIG. 1. The first end 29 and the second end 31 extend into opposite sides of the liquid storage medium 21 for contact with liquid material contained therein. Also preferably, the heater 14 at least partially surrounds a central portion of the wick 28 such that when the heater is activated, the liquid in the central portion of the wick 28 is vaporized by the heater 14 to vaporize the liquid material and form an aerosol.

One advantage of this embodiment is that the liquid material in the liquid supply 22 is protected from oxygen (because oxygen cannot generally enter the liquid storage portion via the wick) and, in some embodiments light, so that the risk of degradation of the liquid material is significantly reduced. Thus, a high level of shelf-life and cleanliness can be maintained.

As shown in FIGS. 1-3, the mouth-end insert 8, includes at least two diverging outlets 24. (e.g, 3, 4, 5, or preferably 6 to 8 outlets or more). Preferably, the outlets 24 of the mouth-end insert 8 are located at ends of off-axis passages 80 (shown in FIG. 3) and are angled outwardly in relation to the longitudinal direction of the electronic cigarette 60 (i.e., divergently). As used herein, the term “off-axis” denotes at an angle to the longitudinal direction of the electronic cigarette. Also preferably, the mouth-end insert (or flow guide) 8 includes outlets uniformly distributed around the mouth-end insert 8 so as to substantially uniformly distribute aerosol in a smoker's mouth during use. Thus, as the aerosol passes into a smoker's mouth, the aerosol enters the mouth and moves in different directions so as to provide a full mouth feel as compared to electronic cigarettes having an on-axis single orifice which directs the aerosol to a single location in a smoker's mouth.

In addition, the outlets 24 and off-axis passages 80 are arranged such that droplets of unaerosolized liquid material carried in the aerosol impact interior surfaces 81 of the mouth-end insert 8 and/or interior surfaces of the off-axis passages such that the droplets are removed or broken apart. In the preferred embodiment, the outlets of the mouth-end insert are located at the ends of the off-axis passages and are angled at 5 to 60° with respect to the central axis of the outer tube 6 so as to more completely distribute aerosol throughout a mouth of a smoker during use and to remove droplets.

Preferably, each outlet has a diameter of about 0.015 inch to about 0.090 inch (e.g., about 0.020 inch to about 0.040 inch or about 0.028 inch to about 0.038 inch). In one embodiment, the size of the outlets 8 and off-axis passages 80 along with the number of outlets can be selected to adjust the resistance to draw (RTD) of the electronic cigarette 60, if desired.

As shown in FIG. 1, an interior surface 81 of the mouth-end insert 8 can comprise a generally domed surface. Alternatively, as shown in FIG. 3, the interior surface 81′ of the mouth-end insert 8 can be generally cylindrical or frustoconical, with a planar end surface. Preferably, the interior surface is substantially uniform over the surface thereof or symmetrical about the longitudinal axis of the mouth-end insert 8. However, in other embodiments, the interior surface can be irregular and/or have other shapes.

Preferably, the mouth-end insert 8 is integrally affixed within the outer tube 6 of the first section 70. Moreover, the mouth end insert 8 can be formed of a polymer selected from the group consisting of low density polyethylene, high density polyethylene, polypropylene, polyvinylchloride, polyetheretherketone (PEEK) and combinations thereof. The mouth end insert 8 may also be colored if desired.

In a preferred embodiment, the electronic cigarette 60 is about the same size as a conventional cigarette. In some embodiments, the electronic cigarette 60 can be about 80 mm to about 110 mm long, preferably about 80 mm to about 100 mm long and about 7 mm to about 8 mm in diameter. For example, in a preferred embodiment, the electronic cigarette is about 84 mm long and has a diameter of about 7.8 mm.

In one embodiment, the electronic cigarette 60 can also include a filter segment (not shown) upstream of the heater 14 and operable to restrict flow of air through the electronic cigarette 60. The addition of a filter segment can also aid in adjusting the resistance to draw.

The outer tube 6 and/or the inner tube 62 may be formed of any suitable material or combination of materials. Examples of suitable materials include metals, alloys, plastics or composite materials containing one or more of those materials, or thermoplastics that are suitable for food or pharmaceutical applications, for example polypropylene, polyetheretherketone (PEEK), ceramic, and polyethylene. Preferably, the material is light and non-brittle.

As shown in FIG. 4, the electronic cigarette 60 can also include a sleeve assembly 87 removably and/or rotatably positioned about a first section 70 of the electronic cigarette 60. Moreover, the sleeve assembly 87 insulates at least a portion of the first section 70 so as to maintain the temperature of the aerosol prior to delivery to the smoker. In the preferred embodiment, the sleeve assembly 87 is rotatable about the electronic cigarette 60 and includes spaced apart slots 88 arranged transversely about the sleeve assembly such that the slots 88 line up with the air inlets 44 in the first section 70 to allow air to pass into the electronic cigarette 60 when a smoker draws a puff. Before or during smoking, the smoker can rotate the sleeve assembly 87 such that the air inlets 44 are at least partially blocked by the sleeve assembly 87 so as to adjust the resistance to draw and/or ventilation of the electronic cigarette 60.

Preferably, the sleeve assembly 87 is made of silicone or other pliable material so as to provide a soft mouthfeel to the smoker. Moreover, the sleeve assembly 81 can prevent the outer tube 6 from warming a smoker's mouth if too much heat is generated. However, the sleeve assembly 87 can be formed in one or more pieces and can be formed of a variety of materials including plastics, metals and combinations thereof. In a preferred embodiment, the sleeve assembly 87 is a single piece formed of silicone. The sleeve assembly 87 can be removed and reused with other electronic cigarettes or can be discarded along with the first section 70. The sleeve assembly 87 can be any suitable color and/or can include graphics or other indicia.

As shown in FIG. 5, the electronic cigarette 60 can also include an aroma strip 89 located on an outer surface 91 of at least one of the first section 70 and the second section 72. Alternatively, the aroma strip 89 can be located on a portion of the sleeve assembly 87. Preferably, the aroma strip 89 is located between the battery of the device and the heater such that the aroma strip 89 is adjacent a smoker's nose during smoking. The aroma strip 89 can include a flavor aroma gel, film or solution including a fragrance material that is released before and/or during smoking. In one embodiment, the flavor aroma of the gel, fluid and/or solution can be released by the action of a puff which may open a vent over the aroma strip when positioned inside the first section 70 (not shown). Alternatively, heat generated by the heater 14 can cause the release of the aroma.

In one embodiment, the aroma strip 89 can include tobacco flavor extracts. Such an extract can be obtained by grinding tobacco material to small pieces and extracting with an organic solvent for a few hours by shaking the mixture. The extract can then be filtered, dried (for example with sodium sulfate) and concentrated at controlled temperature and pressure. Alternatively, the extracts can be obtained using techniques known in the field of flavor chemistry, such as the Solvent Assisted Flavor Extraction (SAFE) distillation technique (Engel et al. 1999), which allows separation of the volatile fraction from the non-volatile fraction. Additionally, pH fractionation and chromatographic methods can be used for further separation and/or isolation of specific compounds. The intensity of the extract can be adjusted by diluting with an organic solvent or water.

The aroma strip 89 can be a polymeric or paper strip to which the extract can be applied, for example, using a paintbrush or by impregnation. Alternatively, the extract can be encapsulated in a paper ring and/or strip and released manually by the smoker, for example by squeezing the aroma strip 89 during smoking so as to release the aroma.

As shown in FIGS. 6 and 7, in an alternative embodiment, the electronic cigarette of FIGS. 1, 4, 9 and 12 can includes a mouth-end insert 8 having a stationary piece 27 and a rotatable piece 25. Outlets 24, 24′ are located in each of the stationary piece 27 and the rotatable piece 25. The outlets 24, 24′ match up as shown to allow aerosol to enter a smoker's mouth. However, the rotatable piece 25 can be rotated within the mouth-end insert 8 so as to at least partially block one or more of the outlets 24 in the stationary piece 27 of the mouth-end insert 8. Thus, the consumer can adjust the amount of aerosol drawn with each puff. The outlets 24, 24′ can be formed in the mouth-end insert 8 such that the outlets 24, 24′ diverge to provide a fuller mouth feel during inhalation of the aerosol.

The above teachings provide examples of an electronic cigarette 60. Further details of the electronic cigarette can be found in commonly owned Non-Provisional patent application Ser. No. 13/756,127 filed Jan. 31, 2013, the entire content of which is incorporated herein by reference thereto.

Not wishing to be bound by theory, it is believed that the amount of voltage applied to the mesh heater can alter the particle size distribution of the aerosol.

The teachings herein are applicable to electronic cigars, and other smoking articles. References to an “electronic smoking article” are intended to be inclusive of electronic cigars, electronic cigarettes and the like.

When the word “about” is used in this specification in connection with a numerical value, it is intended that the associated numerical value include a tolerance of ±10% around the stated numerical value. Moreover, when reference is made to percentages in this specification, it is intended that those percentages are based on weight, i.e., weight percentages.

Moreover, when the words “generally” and “substantially” are used in connection with geometric shapes, it is intended that precision of the geometric shape is not required but that latitude for the shape is within the scope of the disclosure. When used with geometric terms, the words “generally” and “substantially” are intended to encompass not only features which meet the strict definitions but also features which fairly approximate the strict definitions.

It will now be apparent that a new, improved, and nonobvious electronic cigarette has been described in this specification with sufficient particularity as to be understood by one of ordinary skill in the art. Moreover, it will be apparent to those skilled in the art that numerous modifications, variations, substitutions, and equivalents exist for features of the electronic cigarette which do not materially depart from the spirit and scope of the invention. Accordingly, it is expressly intended that all such modifications, variations, substitutions, and equivalents which fall within the spirit and scope of the invention as defined by the appended claims shall be embraced by the appended claims.

Claims

1. An electronic vaping device comprising:

a heater including, a ribbon of electrically resistive mesh material wound about a wick, the wick in communication with a liquid supply including liquid material, the heater configured to vaporize liquid material, wherein the ribbon is configured as a helix.

2. The electronic vaping device of claim 1, wherein the ribbon comprises at least one material selected from the group consisting of stainless steel, copper, copper alloys, ceramic materials coated with film resistive material, nickel-chromium alloys, and combinations thereof.

3. The electronic vaping device of claim 1, wherein the ribbon is about 200 to about 600 mesh.

4. The electronic vaping device of claim 1, wherein the ribbon is about 400 mesh.

5. The electronic vaping device of claim 1, wherein the ribbon is formed with wire having a diameter of about 0.001 inch or greater.

6. The electronic vaping device of claim 1, wherein the ribbon is wound about the wick 1 to 10 times.

7. The electronic vaping device of claim 1, wherein the ribbon is elongate at at least one end portion thereof.

8. The electronic vaping device of claim 1, wherein the heater has a length ranging from about 10 mm to about 15 mm.

9. The electronic vaping device of claim 1, wherein the heater has a width ranging from about 0.5 mm to about 2.0 mm.

10. The electronic vaping device of claim 1, wherein the ribbon has an electrical resistance ranging from about 0.3 Ohm to about 10 Ohms.

11. The electronic vaping device of claim 1, wherein the ribbon includes a conductive connection region across a width of the ribbon.

Referenced Cited
U.S. Patent Documents
1771366 July 1930 Wyss et al.
1968509 July 1934 Tiffany
2057353 October 1936 Whittlemore, Jr.
2068518 January 1937 Simpson
2104266 January 1938 McCormick
2406275 August 1946 Wejnarth
2442004 May 1948 Hayward-Butt
2558127 June 1951 Downs
2907686 October 1959 Siegel
2971039 February 1961 Western
2972557 February 1961 Toulmin, Jr.
2974669 March 1961 Ellis
3062218 November 1962 Temkovits
3200819 August 1965 Gilbert
3255760 June 1966 Selker
3258015 June 1966 Ellis et al.
3356094 December 1967 Ellis et al.
3363633 January 1968 Weber
3402723 September 1968 Hu
3482580 December 1969 Hollabaugh
3521643 July 1970 Toth
3559300 February 1971 Fox
3608560 September 1971 Briskin et al.
3681018 August 1972 Knauff
3738374 June 1973 Bennett
3744496 July 1973 McCarty et al.
3804100 April 1974 Fariello
3875476 April 1975 Crandall et al.
3878041 April 1975 Leitnaker et al.
3889690 June 1975 Guarnieri
3895219 July 1975 Richerson et al.
3943941 March 16, 1976 Boyd et al.
4016061 April 5, 1977 Wasa et al.
4068672 January 17, 1978 Guerra
4077784 March 7, 1978 Vayrynen
4083372 April 11, 1978 Boden
4098725 July 4, 1978 Yamamoto et al.
4110260 August 29, 1978 Yamamoto et al.
4131119 December 26, 1978 Blasutti
4164230 August 14, 1979 Pearlman
4193411 March 18, 1980 Faris et al.
4215708 August 5, 1980 Bron
4219032 August 26, 1980 Tabatznik et al.
4246913 January 27, 1981 Ogden et al.
4256945 March 17, 1981 Carter
4259970 April 7, 1981 Green, Jr.
4331166 May 25, 1982 Hale
4419302 December 6, 1983 Nishino et al.
4457319 July 3, 1984 Lamb et al.
4493331 January 15, 1985 Porenski, Jr.
4517996 May 21, 1985 Vester
4649944 March 17, 1987 Houck, Jr. et al.
4687008 August 18, 1987 Houck, Jr. et al.
4735217 April 5, 1988 Gerth et al.
4765347 August 23, 1988 Sensabaugh, Jr. et al.
4804002 February 14, 1989 Herron
4941486 July 17, 1990 Dube et al.
4945929 August 7, 1990 Egilmex
4945931 August 7, 1990 Gori
4981522 January 1, 1991 Nichols et al.
4991606 February 12, 1991 Serrano et al.
4993436 February 19, 1991 Bloom, Jr.
5016656 May 21, 1991 McMurtrie
5040552 August 20, 1991 Schleich et al.
5042510 August 27, 1991 Curtiss et al.
5045237 September 3, 1991 Washburn
5060671 October 29, 1991 Counts et al.
5076296 December 31, 1991 Nystrom et al.
5085804 February 4, 1992 Washburn
5093894 March 3, 1992 Deevi et al.
5095921 March 17, 1992 Losee et al.
5116298 May 26, 1992 Bondanelli et al.
5137578 August 11, 1992 Chan
5139594 August 18, 1992 Rabin
5144962 September 8, 1992 Counts et al.
5144964 September 8, 1992 Demain
5157242 October 20, 1992 Hetherington et al.
5159940 November 3, 1992 Hayward et al.
5179966 January 19, 1993 Losee et al.
5224498 July 6, 1993 Deevi et al.
5228460 July 20, 1993 Sprinkel et al.
5235157 August 10, 1993 Blackburn
5249586 October 5, 1993 Morgan et al.
5269327 December 14, 1993 Counts et al.
5274214 December 28, 1993 Blackburn
5285050 February 8, 1994 Blackburn
5322075 June 21, 1994 Deevi et al.
5353813 October 11, 1994 Deevi et al.
5369723 November 29, 1994 Counts et al.
5388594 February 14, 1995 Counts et al.
5408574 April 18, 1995 Deevi et al.
5473251 December 5, 1995 Mori
5498855 March 12, 1996 Deevi et al.
5505214 April 9, 1996 Collins et al.
5591368 January 7, 1997 Fleischhauer et al.
5595706 January 21, 1997 Sikka et al.
5613504 March 25, 1997 Collins et al.
5665262 September 9, 1997 Hajaligol et al.
5724997 March 10, 1998 Smith et al.
5865185 February 2, 1999 Collins et al.
5878752 March 9, 1999 Adams et al.
5894841 April 20, 1999 Voges
5935975 August 10, 1999 Rose et al.
6155268 December 5, 2000 Takeuchi
6196218 March 6, 2001 Voges
6598607 July 29, 2003 Adiga et al.
6715487 April 6, 2004 Nichols et al.
6772756 August 10, 2004 Shayan
6810883 November 2, 2004 Felter et al.
6854470 February 15, 2005 Pu
7131599 November 7, 2006 Katase
7167641 January 23, 2007 Tam et al.
7458374 December 2, 2008 Hale et al.
D590988 April 21, 2009 Hon
D590989 April 21, 2009 Hon
D590990 April 21, 2009 Hon
D590991 April 21, 2009 Hon
7527059 May 5, 2009 Iannuzzi
7614402 November 10, 2009 Gomes
7726320 June 1, 2010 Robinson et al.
7789089 September 7, 2010 Dube et al.
7810508 October 12, 2010 Wyss-Peters et al.
7832410 November 16, 2010 Hon
7845359 December 7, 2010 Montaser
7878962 February 1, 2011 Karles et al.
7913688 March 29, 2011 Cross et al.
7997280 August 16, 2011 Rosenthal
8079371 December 20, 2011 Robinson et al.
D655036 February 28, 2012 Zhou
8113215 February 14, 2012 Rasouli et al.
8118161 February 21, 2012 Guerrera et al.
8127772 March 6, 2012 Montaser
8156944 April 17, 2012 Han
8157918 April 17, 2012 Becker et al.
8205622 June 26, 2012 Pan
8258192 September 4, 2012 Wu et al.
8314591 November 20, 2012 Terry et al.
8365742 February 5, 2013 Hon
8371310 February 12, 2013 Brenneise
8375957 February 19, 2013 Hon
D684311 June 11, 2013 Liu
8459270 June 11, 2013 Coven et al.
8499766 August 6, 2013 Newton
8550069 October 8, 2013 Alelov
9226525 January 5, 2016 Liu
20010035409 November 1, 2001 Giberson et al.
20020112723 August 22, 2002 Schuster
20040020500 February 5, 2004 Wrenn et al.
20040035409 February 26, 2004 Harwig
20040050396 March 18, 2004 Squeo
20050016550 January 27, 2005 Katase
20060191546 August 31, 2006 Takano et al.
20060196518 September 7, 2006 Hon
20070102013 May 10, 2007 Adams et al.
20070267032 November 22, 2007 Shan
20080047571 February 28, 2008 Braunshteyn et al.
20080230052 September 25, 2008 Montaser
20090056729 March 5, 2009 Zawadzki et al.
20090126745 May 21, 2009 Hon
20090133704 May 28, 2009 Strickland et al.
20090151717 June 18, 2009 Bowen et al.
20090162294 June 25, 2009 Werner
20090188490 July 30, 2009 Han
20090230117 September 17, 2009 Fernando et al.
20090272379 November 5, 2009 Thorens et al.
20090283103 November 19, 2009 Nielsen et al.
20100031968 February 11, 2010 Sheikh et al.
20100083959 April 8, 2010 Siller
20100126505 May 27, 2010 Rinker
20100200008 August 12, 2010 Taieb
20100206317 August 19, 2010 Albino et al.
20100242975 September 30, 2010 Hearn
20100307518 December 9, 2010 Wang
20110011396 January 20, 2011 Fang
20110036346 February 17, 2011 Cohen et al.
20110036363 February 17, 2011 Urtsev et al.
20110094523 April 28, 2011 Thorens et al.
20110120455 May 26, 2011 Murphy
20110120482 May 26, 2011 Brenneise
20110147486 June 23, 2011 Greim et al.
20110155153 June 30, 2011 Thorens et al.
20110232654 September 29, 2011 Mass
20110245493 October 6, 2011 Rabinowitz et al.
20110253798 October 20, 2011 Tucker
20110265806 November 3, 2011 Alarcon et al.
20110277756 November 17, 2011 Terry et al.
20110277757 November 17, 2011 Terry et al.
20110277760 November 17, 2011 Terry et al.
20110277761 November 17, 2011 Terry et al.
20110277764 November 17, 2011 Terry et al.
20110277780 November 17, 2011 Terry et al.
20110290244 December 1, 2011 Schennum
20110303231 December 15, 2011 Li
20110309157 December 22, 2011 Yang
20120006342 January 12, 2012 Rose et al.
20120090629 April 19, 2012 Turner et al.
20120111347 May 10, 2012 Hon
20120118301 May 17, 2012 Montaser
20120145169 June 14, 2012 Wu
20120167906 July 5, 2012 Gysland
20120174914 July 12, 2012 Pirshafiey et al.
20120186594 July 26, 2012 Liu
20120199146 August 9, 2012 Marangos
20120199663 August 9, 2012 Qiu
20120211015 August 23, 2012 Li et al.
20120230659 September 13, 2012 Goodman et al.
20120260927 October 18, 2012 Liu
20120285475 November 15, 2012 Liu
20120312313 December 13, 2012 Frija
20120318882 December 20, 2012 Abehasera
20130014772 January 17, 2013 Liu
20130019887 January 24, 2013 Liu
20130025609 January 31, 2013 Liu
20130180533 July 18, 2013 Kim
20130192615 August 1, 2013 Tucker et al.
20130192616 August 1, 2013 Tucker et al.
20130192618 August 1, 2013 Li
20130192619 August 1, 2013 Tucker et al.
20130192620 August 1, 2013 Tucker et al.
20130192621 August 1, 2013 Li et al.
20130192622 August 1, 2013 Tucker et al.
20130192623 August 1, 2013 Tucker et al.
20130213418 August 22, 2013 Tucker et al.
20140109905 April 24, 2014 Yamada
20140238423 August 28, 2014 Tucker
20140360517 December 11, 2014 Taggart
20150090280 April 2, 2015 Chen
20150101606 April 16, 2015 White
20150230522 August 20, 2015 Horn
20150245669 September 3, 2015 Cadieux
20160021934 January 28, 2016 Cadieux
20160120221 May 5, 2016 Mironov
20160331034 November 17, 2016 Cameron
20160331037 November 17, 2016 Cameron
20160353801 December 8, 2016 Zinovik
20160361452 December 15, 2016 Blackley
20170020195 January 26, 2017 Cameron
20170079330 March 23, 2017 Mironov
20170095624 April 6, 2017 Davidson
Foreign Patent Documents
421623 June 1937 BE
1202378 March 1986 CA
87104459 February 1988 CN
1205849 January 1999 CN
2777995 May 2006 CN
101322579 December 2008 CN
201709398 January 2011 CN
102014677 April 2011 CN
201789924 April 2011 CN
201797997 April 2011 CN
102106611 June 2011 CN
201860753 June 2011 CN
102166044 August 2011 CN
202014571 October 2011 CN
202014572 October 2011 CN
202026804 November 2011 CN
202233005 May 2012 CN
202233007 May 2012 CN
102665459 September 2012 CN
3640917 August 1988 DE
3735704 May 1989 DE
19854009 May 2000 DE
69824982 October 2004 DE
0893071 July 1908 EP
0277519 August 1988 EP
0295122 December 1988 EP
0358002 March 1990 EP
0358114 March 1990 EP
0488488 June 1992 EP
0503767 September 1992 EP
0845220 June 1998 EP
0857431 August 1998 EP
1989946 November 2008 EP
2110033 October 2009 EP
2113178 November 2009 EP
2148079 May 1985 GB
61068061 April 1986 JP
3164992 May 2001 JP
2003092175 March 2003 JP
2006320286 November 2006 JP
2009-537119 October 2009 JP
2011-518567 June 2011 JP
2011-165527 August 2011 JP
100636287 October 2006 KR
8201585 November 1982 NL
WO-86/02528 May 1986 WO
WO-9003224 April 1990 WO
WO-95/02970 February 1995 WO
WO-00/28843 May 2000 WO
WO-03/034847 May 2003 WO
WO-03037412 May 2003 WO
WO-2004/080216 September 2004 WO
WO-2004/095955 November 2004 WO
WO-2005/099494 October 2005 WO
WO-2005120614 December 2005 WO
WO-2007024130 March 2007 WO
WO-2007/066374 June 2007 WO
WO-2007/078273 July 2007 WO
WO-2007/098337 August 2007 WO
WO-2007/131449 November 2007 WO
WO-2007/131450 November 2007 WO
WO-2007/141668 December 2007 WO
WO-2008/055423 May 2008 WO
WO-2010/091593 August 2010 WO
WO-2010/145468 December 2010 WO
WO-2011/045672 April 2011 WO
WO-2011063970 June 2011 WO
WO-2011079932 July 2011 WO
WO-2011/121326 October 2011 WO
WO-2011/124033 October 2011 WO
WO-2011/125058 October 2011 WO
WO-2011/146372 November 2011 WO
WO-2012/088675 July 2012 WO
WO-2012/109371 August 2012 WO
WO-2012/129787 October 2012 WO
WO-2012/129812 October 2012 WO
WO-2012/142293 October 2012 WO
Other references
  • ECF ‘Modeling Forum’ (“All my mods parti” Discussion in Modding forum started by Raidy, Oct. 26, 2010 on www.e-cigarette-forum.com)—Accessed Jun. 26, 2015.
  • International Preliminary Report dated Nov. 27, 2014.
  • International Search Report and Written Opinion for PCT/US13/24228 dated Apr. 9, 2013.
  • International Search Report and Written Opinion for PCT/US13/24211 dated Apr. 19, 2013.
  • International Search Report and Written Opinion for PCT/US13/24219 dated Apr. 22, 2013.
  • International Search Report and Written Opinion for PCT/US13/24229 dated Apr. 22, 2013.
  • International Search Report and Written Opinion for PCT/US13/24215 dated Apr. 22, 2013.
  • International Search Report and Written Opinion for PCT/US13/24222 dated Apr. 24, 2013.
  • International Search Report and Written Opinion for PCT/US 13/27424 dated Apr. 25, 2013.
  • International Search Report and Written Opinion for PCT/US 13/27 432 dated May 2, 2013.
  • International Search Report and Written Opinion for PCT/US13/24224 dated May 13, 2013.
  • U.S. Appl. No. 13/843,028, filed Mar. 15, 2013, to Fath et al.
  • U.S. Appl. No. 13/843,449, filed Mar. 15, 2013, to Fath et al.
  • European Search Report dated Dec. 11, 2015.
  • Japanese Office Action dated Nov. 29, 2016 issued in corresponding Japanese Application No. 2014-558894 (with translation).
  • Chinese Office Action dated Dec. 21, 2016 issued in corresponding Chinese Application No. 201380010642.3 (with translation).
  • European Office Action dated Jan. 30, 2017 issued in corresponding European Application No. 13751097.0-1666.
  • Russian Office Action dated Mar. 3, 2017 issued in corresponding Russian Application No. 2014138085.
  • Chinese Office Action dated Jun. 23, 2017 issued in corresponding Chinese Application No. 201380010642.3 (with translation).
  • ECF “Modding Forum” (“All my mods part1” Discussion in Modding Forum started by Raidy, Oct. 26, 2010 on www.e-cigarette-forum.com).
  • Zakecig (“ViviTank Stainless U Wick and Stainless wire”, Youtube.com video published on Jul. 30, 2012; www.youtube.com/watch?v-0azcHg8rbis).
  • Zakecig (VifiTank Stainless U Wick and Stainless wire, Youtube.com video published on Jul. 30, 2012; www.youtube.com/watch?v-0azcH8rbis screencapture from 0:11/0.23.
  • Examination Report for corresponding Malaysian Application No. PI 2014002422 dated Feb. 28, 2018.
  • Japanese Office Action dated Oct. 23, 2018 issued in corresponding Japanese Application No. 2017-221387 (with translation).
  • European Office Action dated Mar. 21, 2019 issued in corresponding European Application No. 18210978.5.
  • Examination Report for corresponding Indian Application No. 6268/CHENP/2014 dated Apr. 29, 2019 and English translation thereof.
Patent History
Patent number: 10383371
Type: Grant
Filed: Jan 29, 2018
Date of Patent: Aug 20, 2019
Patent Publication Number: 20180160740
Assignee: ALTRIA CLIENT SERVICES LLC (Richmond, VA)
Inventors: Christopher S. Tucker (Midlothian, VA), Geoffrey Brandon Jordan (Midlothian, VA)
Primary Examiner: Jason L Lazorcik
Application Number: 15/882,310
Classifications
Current U.S. Class: To Porous Distributor Exposed To Atmosphere (239/43)
International Classification: A24F 47/00 (20060101); H05B 3/34 (20060101); H05B 3/00 (20060101); H05B 3/12 (20060101); H05B 3/14 (20060101);